Question: interface(showassumed=0); has no effect on removing tilda from assumed variables

according to

http://www.maplesoft.com/support/faqs/detail.aspx?sid=32658

But the above does not work in Maple 18, windows: (I use worksheet)

restart;
assume(z>0):
interface(showassumed=0):
z;

Only the other solution works, which is using options->display->turnoff assumed variables tilda.

Why does not the above command work?

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